#simple_machine__machine  a device for overcoming resistance at one point by applying force at some other point
  supertype:  mechanical_device  mechanism consisting of a device that works on mechanical principles
  subtype:  inclined_plane  a simple machine for elevating objects; consists of plane surface that makes an acute angle with the horizontal
     subtype:  ramp__incline  an inclined surface or roadway that moves traffic from one level to another
        subtype:  ski_jump__skijump  a steep downward ramp from which skiers jump
     subtype:  screw.inclined_plane  a simple machine of the inclined-plane type consisting of a spirally threaded cylindrical rod that engages with a similarly threaded hole
     subtype:  wedge  something usable as an inclined plane (shaped like a V) that can be pushed between two things to separate them
        subtype:  ax_head__axe_head__axehead  the cutting head of an ax
        subtype:  colter__coulter  a sharp steel wedge that precedes the plow and cuts vertically through the soil
        subtype:  moldboard__mouldboard  wedge formed by the curved part of a steel plow blade that turns the furrow
        subtype:  plowshare__ploughshare__share  a sharp steel wedge that cuts loose the top layer of soil
        subtype:  coign__quoin__coigne  expandable metal or wooden wedge used by printers to lock up a form within a chase
        subtype:  shim  a thin wedge of material (wood or metal or stone) for driving into crevices
  subtype:  lever.simple_machine  a simple machine that gives a mechanical advantage when given a fulcrum
  subtype:  pulley-block__pulley__block  a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope
     subtype:  bollock__bullock_block__bullockblock  a pulley-block at the head of a topmast
     subtype:  fairlead  a pulley-block used to guide a rope forming part of a ship's rigging to avoid chafing
        subtype:  snatch_block  a pulley-block that can be opened to receive the bight of a rope
     subtype:  idle_pulley__idler_pulley__idlerpulley__idle_wheel  a pulley on a shaft that presses against a guide belt to guide or tighten it
  subtype:  wheel  a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)
     subtype:  balance_wheel__balancewheel  a wheel oscillating against the hairspring of a timepiece to regulate its beat
     subtype:  bicycle_wheel__bicyclewheel  the wheel of a bicycle
     subtype:  buffing_wheel__buffingwheel  a wheel that is covered with soft material
     subtype:  cartwheel.wheel  a wheel that has wooden spokes and a metal rim
     subtype:  car_wheel__carwheel  a wheel that has a tire and rim and hubcap; used to propel the car
        subtype:  fifth_wheel.car_wheel__spare  an extra car wheel and tire
     subtype:  daisy_print_wheel__daisyprintwheel__daisy_wheel__daisywheel  a wheel around which is a set of print characters that make a typing impression on paper
     subtype:  driving_wheel__drivingwheel  a wheel that drives a motor vehicle (transforms torque into a tractive force)
     subtype:  gear_wheel__gear__cogwheel  a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
        subtype:  bevel_gear__bevelgear__pinionandcrownwheel__pinion_and_ring_gear  gears that mesh at an angle
           subtype:  differential_gear__differential  a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves
        subtype:  escape_wheel  gear that engages a rocking lever
        subtype:  pinion  a gear with a small number of teeth designed to mesh with a larger wheel or rack
           subtype:  lantern_pinion__lanternpinion__lantern_wheel__lanternwheel  a small pinion having cylindrical bars instead of teeth, used chiefly in inexpensive clocks
        subtype:  planetary_gear__planetarygear__epicyclic_gear__epicyclicgear__planet_wheel__planet_gear  an outer gear that revolves about a central sun gear of an epicyclic train
        subtype:  rack_and_pinion  a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa)
        subtype:  spur_gear__spur_wheel  gear wheels that mesh in the same plane
        subtype:  sun_gear__sungear  the central gear in a epicyclic train
        subtype:  worm_gear  gear consisting of a shaft with screw thread (the worm) that meshes with a toothed wheel (the worm wheel); changes the direction of the axis of rotary motion
        subtype:  worm_wheel  gear with the thread of a worm
     subtype:  grinding_wheel__emery_wheel__emerywheel  a wheel composed of abrasive material; used for grinding
     subtype:  handwheel.wheel  a wheel worked by hand
     subtype:  nosewheel  a wheel located under the nose of an airplane that is part of the plan's landing gear
     subtype:  paddlewheel  a large wheel fitted with paddles and driven by an engine in order to propel a boat
     subtype:  potter's_wheel  a horizontal rotating wheel holding the clay being shaped by a potter
     subtype:  ratchet_wheel__ratchetwheel  toothed wheel held in place by a pawl or detent and turned by a lever
     subtype:  roller.wheel  a small wheel without spokes (as on a roller skate)
        subtype:  caster.roller__castor  a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable
     subtype:  toothed_wheel__toothedwheel__roulette  a wheel with teeth for making a row of perforations
     subtype:  rowel  a small spiked wheel at the end of a spur
     subtype:  sprocket_wheel__sprocket  thin wheel with teeth that engage with a chain
     subtype:  trundle  small wheel or roller
     subtype:  wagon_wheel__wagonwheel  a wheel of a wagon
     subtype:  waterwheel__water_wheel__waterwheel  a wheel that rotates by direct action of water; a simple turbine
        subtype:  millwheel  water wheel that is used to drive machinery in a mill
        subtype:  noria  a water wheel with buckets attached to the rim; used to raise water for transfer to an irrigation channel
     subtype:  water_wheel__waterwheel__waterwheel  a wheel with buckets attached to its rim; raises water from a stream or pond

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